Trends are like flings. You play around with something on a whim, have your fun, and if it works out, great. If not, you move on, and no one gets hurt. Check out some of our favorite trends, and remember: Nothing ventured, nothing gained.

Fall means pumpkins, apple-cider donuts, leaf peepers, and cozy sweaters. It also means fall manicures, which are often richer, darker, and a bit more glamorous than their summer counterparts. Here are my most coveted fall...